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CVE-2026-50266 low CVSS 2.2

Authorization Flaw in neutron (CVE-2026-50266)

Summary

Vulnerability in neutron (CVE-2026-50266). Risk of unauthorized operations or information disclosure. Mitigation: upgrade to 28.0.1 or later.

Original description

The description as published by the source.

In OpenStack Neutron before 28.0.1, a project manager can create or update a port on a shared network owned by another project and set device_owner to a value that has "network:" at the beginning ("network:dhcp" for example). The default port RBAC policies incorrectly included PROJECT_MANAGER without requiring network ownership, allowing any project manager to obtain trusted network-service port behavior on shared networks. Depending on backend and deployment, this can bypass anti-spoofing and security group protections, enabling DHCP, MAC, or IP spoofing against other tenants on the shared network. This is a regression of CVE-2015-5240 (OSSA-2015-018).

Source: NIST National Vulnerability Database NVD GitHub Advisory

Auto-generated summary

Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.

A vulnerability tracked as CVE-2026-50266 has been found in neutron.
Risk of unauthorized operations or information disclosure. CVSS score: 2.2/10.
What to do: upgrade neutron to 28.0.1 or later.
If unsure, ask your IT team or search "neutron CVE-2026-50266" on the vendor's site.

CVE-2026-50266 (neutron) — CWE-863 / CVSS v3 2.2
Attack vector: remote (network-reachable) / no user interaction
Patched: 28.0.1 — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.

❓ What is the problem

Incorrect authorization (CWE-863) exists in neutron.

📍 Affected scope

Check the vendor advisory for the affected versions of neutron.

🔥 Severity

Severity: Low (CVSS 2.2/10). Risk of unauthorized operations or information disclosure.

🔧 How to fix

Update to 28.0.1.

🛡️ Workaround

Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.

🔍 Detection

Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'neutron' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.

Response actions

Concrete steps and command examples for SOC/SRE teams to execute in order

  1. 1
    Identify exposure identify 
    grep -r 'neutron' . | grep -v node_modules

    リポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で neutron を grep し、稼働しているサービス・バージョンを把握する。

  2. 2
    Apply patch patch 
    Upgrade neutron to 28.0.1

    ステージング環境で 28.0.1 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。

  3. 3
    Post-deployment verification verify 
    Confirm patched version is live in production

    パッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。

Affected packages

pip neutron
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"28.0.1"}]}]
PyPI neutron
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"28.0.1"}]}]

Fix status by distribution

Fixed packages published by each distribution for this CVE

References

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